The past few days have been spent waiting for my silicone rubber compound to arrive in the mail. It came yesterday and so I promptly mixed everything together and poured an approx 1mm layer on top of my acrylic sheet.
Although the surface came out very smooth there are tons of small bubbles within the mixture. The number of bubbles lowers the translucency of the surface and introduces a great deal of noise into the captured image. I'm glad I gave this a try myself as it was a great learning experience... but now I think I'm going to order a sheet from someone who has real experience at making them (Gravano @ NUIGROUP).
So, I'm back to waiting.